A5015155948- Surface and Thin Film Phenomena
- Quantum and electron transport phenomena
- Wildlife Ecology and Conservation
- X-ray Spectroscopy and Fluorescence Analysis
- Species Distribution and Climate Change
- Physics of Superconductivity and Magnetism
- Advanced Materials Characterization Techniques
- Force Microscopy Techniques and Applications
- Graphene research and applications
- Crystallography and Radiation Phenomena
- Electron and X-Ray Spectroscopy Techniques
- Topological Materials and Phenomena
- Magnetic properties of thin films
- Advanced Electron Microscopy Techniques and Applications
- Semiconductor materials and interfaces
- Advanced Chemical Physics Studies
- X-ray Diffraction in Crystallography
- Mechanical and Optical Resonators
- Quantum, superfluid, helium dynamics
- Rare-earth and actinide compounds
- Human-Animal Interaction Studies
- Electronic and Structural Properties of Oxides
- Global Cancer Incidence and Screening
- Superconducting Materials and Applications
- Silicon Nanostructures and Photoluminescence
Point Loma Nazarene University
2020-2024
National Institute of Standards and Technology
2000-2023
Physical Measurement Laboratory
2020-2023
University of Regensburg
2020
Georgetown University
2020
University of Basel
2020
Seoul National University
2020
Theiss Research
2020
University of Maryland, College Park
2020
Center for Nanoscale Science and Technology
2010
Abstract Recently, the tiger-cat species complex was split into Leopardus tigrinus and guttulus , along with other proposed schemes. We performed a detailed analysis integrating ecological modeling, biogeography, phenotype of four originally recognized subspecies— oncilla pardinoides —and presented new multidimensional niche depiction species. Species distribution models used > 1400 records from museums photographs, all checked for accuracy. Morphological data were obtained...
Abstract Temporal niche shifts can shape predator–prey interactions by enabling predator avoidance, enhancing feeding success, and reducing competition among predators. Using a community-based conservation approach, we investigated temporal partitioning of mammalian predators prey across 12 long-term camera trap surveys in the Pacific slope Talamanca Cordillera Costa Rica. overlap segregation were between predator–predator pairs using analysis, circular statistics, relative abundance after...
The quantum Hall (QH) effect, a topologically non-trivial phase, expanded and brought into focus the concept of topological order in physics. protected edge states are crucial importance to QH effect but have been measured with limited success. graphene take on an even richer role as is distinguished by its four-fold degenerate zero energy Landau level (zLL), where symmetry broken electron interactions top lattice-scale potentials has eluded spatial measurements. In this report, we map...
Research in new quantum materials requires multi-mode measurements spanning length scales, correlations of atomic-scale variables with a macroscopic function, and spectroscopic energy resolution obtainable only at millikelvin temperatures, typically dilution refrigerator. In this article, we describe instrument achieving μeV tunneling in-operando measurement capabilities scanning microscopy, atomic force magnetotransport inside refrigerator operating 10 mK. We the system detail including...
An increasing body of evidence indicates that moonlight influences the nocturnal activity patterns tropical mammals, both predators and prey. One explanation is brighter associated with increased risk predation (Predation Risk hypothesis), but it has also been proposed may be influenced by sensory ecology a species, species rely on visual detection food danger predicted to increase their during bright moonlight, while relying non-visual senses should decrease (Visual Acuity hypothesis). Lack...
Montane cloud forests are highly threatened ecosystems that vulnerable to climate change. These complex habitats harbor many species suffer the negative consequences of this global phenomenon, such as shifts in their distribution and habitat use. The Central American clouded oncilla ( Leopardus pardinoides ) is smallest most endangered wild cat Mesoamerica primarily reported throughout its distribution. poorly understood, with no studies conducted America assessing preferences. To bridge...
The predictions of nonlocal London theory are confirmed by real-space measurements the hexagonal-to-square transition in vortex lattice structure ${\mathrm{V}}_{3}\mathrm{Si}.$ We observe that transforms from hexagonal to nearly square over field range 0--4 T for fields applied along [001] direction. Above $\ensuremath{\approx}0.75\mathrm{T},$ we find orientation is strongly linked symmetry underlying ${\mathrm{V}}_{3}\mathrm{Si}$ crystal and has a (100) plane. Near rhombus-to-square at 4 T,...
For almost a century, magnetic oscillations have been powerful "quantum ruler" for measuring Fermi surface topology. In this study, we used Landau-level spectroscopy to unravel the energy-resolved valley-contrasting orbital magnetism and large susceptibility that contribute energies of Landau levels twisted double-bilayer graphene. These effects led substantial deviations from standard Onsager relation, which manifested as breakdown in scaling orbits. responses emerged nontrivial quantum...
Abstract The evolutionary history and taxonomy of the Leopardus tigrinus species complex have been studied based on several approaches, mostly employing genetic morphological data, leading to distinct classification schemes. We approached this problem from an ecological perspective, with 2 main goals: (i) evaluate niche differences among regional L. populations determine extent divergence them; (ii) identify environmental barriers historical dispersal that could driven differentiation...
Si(5 5 12), a recently discovered, stable high-index surface of silicon, may offer superior template for the growth one-dimensional metallic structures. We are using reflection high-energy electron diffraction, scanning tunneling microscopy (STM), and synchrotron radiation photoemission to determine morphology electronic structure Ag on this surface. 12) exhibits sharp (2×1) reconstruction after flashing ∼1250 °C. Despite many different atomic substructures present in reconstruction, several...
We describe the development of an experimental system, consisting a low temperature scanning tunneling microscope coupled to UHV tip and sample preparation chambers, with goal providing new measurement capabilities for study quantum spin electronic systems on nanometer scale. The physical information desired in such includes: quantized electron energy distributions arising from spatial or magnetic confinement, extent wavefunctions, role electron-electron interactions presence confining...
The ability to pattern and simultaneously study a nanometer-scale potential landscape within hBN-based graphene devices using scanning tunneling microscopy (STM) opens path for detailed investigation of model quantum systems. Here, the authors create double-well applied strong magnetic field induce Landau levels formation dots with single-electron charging characteristics. system can be broadly tuned form weakly coupled combined single dot while STM provides multiple measurement manipulation...